U.S. patent number 8,160,441 [Application Number 12/066,087] was granted by the patent office on 2012-04-17 for optical fiber access network and commuication protection method thereof.
This patent grant is currently assigned to China Mobile Communications Corp.. Invention is credited to Han Li, Bing Wei, Jianming Zhou.
United States Patent |
8,160,441 |
Li , et al. |
April 17, 2012 |
Optical fiber access network and commuication protection method
thereof
Abstract
The present invention relates to an optical fiber access network
and a communication protection method thereof. The optical fiber
access network comprises an optical fiber communication system, a
wireless communication system, a communication service switch
device, a second optical network unit and a protection optical
fiber. The wireless communication system is introduced to protect
the optical fiber between the optical branching divider and the
optical network unit in the optical fiber communication system. The
protection optical fiber or the wireless communication system is
used to protect the communication service respectively when there
is a broken failure between the optical line terminal and the
optical network unit in the optical fiber communication system.
This invention overcomes the limit of the resource, protects
communication service of the optical fiber communication system and
improves the bandwidth utility of the communication system.
Inventors: |
Li; Han (Beijing,
CN), Wei; Bing (Beijing, CN), Zhou;
Jianming (Beijing, CN) |
Assignee: |
China Mobile Communications
Corp. (CN)
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Family
ID: |
36748090 |
Appl.
No.: |
12/066,087 |
Filed: |
August 24, 2006 |
PCT
Filed: |
August 24, 2006 |
PCT No.: |
PCT/CN2006/002172 |
371(c)(1),(2),(4) Date: |
August 27, 2008 |
PCT
Pub. No.: |
WO2007/030999 |
PCT
Pub. Date: |
March 22, 2007 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20090148168 A1 |
Jun 11, 2009 |
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Foreign Application Priority Data
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Sep 12, 2005 [CN] |
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2005 1 0102566 |
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Current U.S.
Class: |
398/5; 398/1;
398/4; 398/2; 398/3 |
Current CPC
Class: |
H04B
10/032 (20130101); H04J 3/14 (20130101); H04J
3/1694 (20130101); H04W 24/04 (20130101); H04W
88/08 (20130101) |
Current International
Class: |
G02F
1/00 (20060101) |
Field of
Search: |
;398/1-38 ;455/560,14
;370/217,221 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2703365 |
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Jun 2005 |
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CN |
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2003298605 |
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Oct 2003 |
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JP |
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Other References
Tsan-Jim Chan; A self protected architecture for wavelength
division multiplexed passive optical networks; Nov. 2003; IEEE
photonics technology letters vol. 15 No. 11, pp. 1660-1662. cited
by examiner .
Zhaoxin Wang, A Novel Centrally Controlled Ptection Scheme for
traffic Restoration in WDM Passive Opitcal Networks; Mar. 2005;
IEEE photonics Technology lletters vol. 17 No. 3; pp. 717-719.
cited by examiner .
Zhao Yubin; Wireless protection switching for Vedio service in
wirelss optical broadband access network; 2009; IC-BNMT; pp.
760-764. cited by examiner .
Publication: International Search Report for International
Application No. PCT/CN2006/002172 filed Aug. 24, 2006,
International Publication No. WO 2007/030999 A1 published Mar. 22,
2007, of China Mobile Communications Corporation for An Optical
Fiber Access Network and a Communication Protection Method Thereof.
cited by other.
|
Primary Examiner: Vanderpuye; Kenneth N
Assistant Examiner: Sandhu; Amritbir
Attorney, Agent or Firm: Olson & Cepuritis, Ltd
Claims
What is claimed is:
1. An optical fiber access network comprising an optical fiber
communication system which is provided with an optical line
terminal (1), an optical branching divider (2), a first optical
network unit (3) and a user terminal integration access device (4),
and a protection optical fiber (92) set between the optical line
terminal (1) and the optical branching divider (2) for protecting
the line of a work optical fiber (91), characterized in that said
optical fiber access network further comprises a wireless base
station (5) connected with said optical branching divider (2)
through a second optical network unit (6); said wireless base
station (5) wirelessly communicates with a wireless user terminal
device (7); said wireless user terminal device (7) and said first
optical network unit (3) are connected with a communication service
switch device (8) for switching the communication line
respectively; said communication service switch device (8) is
connected with said user terminal integration access device (4);
said wireless user terminal device (7) further communicates with
said first optical network unit (3); said first optical network
unit (3) is provided with a second detection module (31) for
detecting signals and a control module (32) for sending a switching
control signal to said communication service switch device (8).
2. The optical fiber access network as claimed in claim 1,
characterized in that said communication service switch device (8)
is integrated with said first optical network unit (3).
3. The optical fiber access network as claimed in claim 1,
characterized in that said second detection module (31) is
connected with said control module (32).
4. The optical fiber access network as claimed in claim 1,
characterized in that said first optical network unit (3) is
further provided with an alarm module (33) for producing an alarm
message of signal loss when said second detection module (31)
detects no signal, said alarm module (33) is connected with the
service interface function module (34) in said first optical
network unit (3).
5. The optical fiber access network as claimed in claim 4,
characterized in that said alarm module (33) is integrated with
said detection module (31).
6. The optical fiber access network as claimed in claim 5,
characterized in that said detection module is an amplitude, power
and/or energy detection device.
7. The optical fiber access network as claimed in claim 1,
characterized in that said optical line terminal (1) is provided
with a first detection module (11) for detecting the signal in the
work optical fiber (91) and the protection optical fiber (92), and
a network management system (12) for managing the integrated
services of said optical line terminal (1); said first detection
module (11) is connected with said network management system
(12).
8. A communication protection method of the optical fiber access
network as claimed in claim 1, characterized in that the
communication service switch device switches the communication
service from the optical fiber communication system to the wireless
communication system, which comprises the following steps: step 1.
the second detection module (31) sending a message of signal loss
to the control module (32) when it detects that the amplitude,
power and/or energy of the signal is less than the preset threshold
power; step 2. said control module (32) sending a switching control
signal to the communication service switch device (8); step 3. said
communication service switch device (8) switching the communication
line connected with the first optical network unit (3) to said
wireless user terminal device (7) in accordance with said switching
control signal so as to make the uplink signal of the communication
service be switched to said wireless user terminal device (7); step
4. said wireless user terminal device (7) transmitting the uplink
signal to the wireless base station (5); step 5. said wireless base
station (5) transmitting the uplink signal to the optical line
terminal (1); step 6. said optical line terminal (1) sending the
downlink signal to said wireless base station (5) through the
optical network unit (6); step 7. said wireless base station (5)
sending the downlink signal to said wireless user terminal device
(7) so as to complete the switching of the communication service
line.
9. The communication protection method of the optical fiber access
network as claimed in claim 8, characterized in that following
steps are further comprised between said step 1 and step 2: step
11. said second detection module (31) sending the message of signal
loss to the alarm module (33); step 12. said alarm module (33)
transmitting the alarm message of signal loss to said wireless user
terminal device (7); step 13. said wireless user terminal device
(7) sending the message of requirement for bandwidth allocation to
the wireless base station (5); step 14. said wireless base station
(5) allocating the corresponding bandwidth to said wireless user
terminal device (7) and sending the confirmation message that the
bandwidth has been allocated; step 15. said wireless user terminal
device (7) sending the request message for switching the
communication service to the wireless communication system to said
control module (32).
10. The communication protection method of the optical fiber access
network as claimed in claim 8, characterized in that said
communication service switch device switches the communication
service from said wireless communication system back to said
optical fiber communication system after said step 7, which
comprises following steps: step 71. said second detection module
(31) sending the message that the signal is received to said
control module (32) when it detects that the amplitude, power
and/or energy of the signal is larger than the preset threshold
power; step 72. said control module (32) sending a switching
control signal to said communication service switch device (8);
step 73. said communication service switch device (8) switching the
communication line connected with the wireless user terminal device
(7) to the first optical network unit (3) in accordance with said
switching control signal so as to make the uplink signal of the
communication service be switched to said first optical network
unit (3); step 74. said first optical network unit (3) transmitting
the uplink signal of the communication service to said optical line
terminal (1) so as to completing the switching of the communication
service line.
11. The communication protection method of the optical fiber access
network as claimed in claim 10, characterized in that following
steps are further comprised between said step 71 and step 72: step
711. the second detection module (31) sending the message that the
downlink signal is received to the alarm module (33); step 712.
said alarm module (33) sending a message that the alarm of signal
loss is relieved to the wireless user terminal device (7); step
713. said wireless user terminal device (7) sending the request
message for bandwidth release to said wireless base station (5);
step 714. said wireless base station (5) releasing the
corresponding bandwidth and sending the confirmation message for
bandwidth release to said wireless user terminal device (7); step
715. said wireless user terminal device (7) sending the request
message for switching the communication service to the optical
fiber communication system to said control module (32).
12. The optical fiber access network as claimed in claim 2,
characterized in that said first optical network unit (3) is
further provided with an alarm module (33) for producing an alarm
message of signal loss when said second detection module (31)
detects no signal, said alarm module (33) is connected with the
service interface function module (34) in said first optical
network unit (3).
13. The optical fiber access network as claimed in claim 3,
characterized in that said first optical network unit (3) is
further provided with an alarm module (33) for producing an alarm
message of signal loss when said second detection module (31)
detects no signal, said alarm module (33) is connected with the
service interface function module (34) in said first optical
network unit (3).
Description
CROSS REFERENCES TO RELATED APPLICATIONS
This application is a national phase application based upon
priority International PCT Patent Application No. PCT/CN2006/002172
filed Aug. 24, 2006, International Publication No. WO/2007/030999
A1 published Mar. 22, 2007, which is based upon priority Chinese
Patent Application No. 200510102566.6 filed Sep. 12, 2005.
FIELD OF THE INVENTION
The present invention relates to an optical fiber access network
and communication protection method thereof and especially relates
to an optical fiber access network which can provide the function
of communication protection and provide wireless communication
protection when the optical fiber breaks, and a communication
protection method which can protect the communication service from
influence.
BACKGROUND OF THE INVENTION
The optical fiber access network is the inevitable trend of optical
fiber communication. The optical fiber access network normally has
five sorts of topological structures as follows: single star
topology, multi-star topology, tree topology, bus topology and ring
topology. The former four sorts can be called star structure.
Compared with ring network and point to point system, the star
network can save more optical fibers and optical receiving and
sending modules, and the branch structure of it is easy for
coverage. Therefore, the star structure is normally adopted in the
optical fiber access network.
For protecting the normal work of communication service, the
optical fiber line needs to be protected in the optical fiber
access network. In prior art, the protection manner of the optical
fiber line between the optical line terminal and the optical
network unit is as follows:
1. The manner of separate fiber in one cable is adopted for
protection, i.e. a main optical fiber and a backup optical fiber
are set in one optical cable. When the main optical fiber is cut
off, the backup optical fiber can be used. However, when the whole
optical cable is cut off, the normal operation of communication
service can't be insured.
2. The manner of separate cable in one pipe is adopted for
protection, i.e. the main optical fiber and the backup optical
fiber are set in different optical cables in one pipe or routing so
that when the main optical fiber is cut off at the optical cable,
the backup optical fiber can be used. However, this manner can only
be used to prevent the optical cable from ordinary failure of being
cut off but not the heavy failure, for example, the accidence of
extensive optical cable pipe being cut off because of the
construction of large-scale machinery.
3. The manner of separate cable in separate pipes is adopted for
protection, i.e. the main optical fiber and the backup optical
fiber are not only in different cables but also in different pipes
or routings. This manner provides the maximum protection to the
optical fiber line, but the economic cost is very high.
Due to being restricted by pipe, optical fiber resources and the
cost of construction, the optical fiber line between the optical
line terminal and the optical branching divider is normally
protected only by the above-mentioned manners, and the optical
fiber line between the optical branching divider and the optical
network unit is seldom protected in the star structure access
network. Once the optical fiber has the failure of being cut off,
the network communication will become invalid.
Although the users who is sensitive to the price and needs the
real-time information communication don't have strict requirement
to the QOS of network and can put up with temporary bad performance
of the network, such as network speed declining and so on, they
can't put up with the break down of the network for long time.
Thus, the adoption of suitable and effective methods for the
protection of the optical fiber access network is the necessary
assurance for communication fluency of the user network.
BRIEF SUMMARY OF THE INVENTION
The main subject of the present invention is to provide an optical
fiber access network and a communication protection method thereof
aiming at the above-mentioned defect existed in the 1+1 protection
manner of the optical fiber access network and the reason and
current situation that the protection to the optical fiber line
between the optical branching divider and the optical network unit
in the star topology optical fiber access network is deficient in
practical use. The optical fiber access network and the method
assemble the wireless communication system and optical fiber
communication system so as to make the communication service of the
optical fiber communication system obtain powerful insurance and
effectively use the communication resource.
In order to realize above subject, the present invention adopts an
optical fiber access network which comprises an optical fiber
communication system which at least consists of an optical line
terminal 1, an optical branching divider 2, a first optical network
unit 3 and an user terminal integration access device 4. A work
optical fiber 91 and a protection optical fiber 92 for protecting
the line of said work optical fiber 91 are set between the optical
line terminal 1 and the optical branching divider 2. Said optical
fiber access network also comprises a wireless base station 5 which
is connected with said optical branching divider 2 through a second
optical network unit 6. Said wireless base station 5 wirelessly
communicates with a wireless user terminal device 7. The wireless
user terminal device 7 and said first optical network unit 3 are
connected with a communication service switch device 8 for
switching the communication line respectively. The communication
service switch device 8 is connected with said user terminal
integration access device 4. Said wireless user terminal device 7
further communicates with said first optical network unit 3. Said
optical line terminal 1 is provided with a first detection module
11 for detecting the signal in the work optical fiber 91 and the
protection optical fiber 92, and a network managing system 12 for
managing the integrated services of said optical line terminal 1.
Said first detection module 11 is connected with said network
management system 12. Said first optical network unit 3 is provided
with a second detection module 31 for detecting signals and a
control module 32 for sending a switching control signal to said
communication service switch device 8. Wherein, said second
detection module 31 can be connected with said control module 32.
Said communication service switch device 8 can be set in said the
first optical network unit 3, that is to say said communication
service switch device 8 can be put into said first optical network
unit 3, i.e. said communication service switch device 8 is
integrated with said first optical network unit 3.
The optical fiber access network can provide protection in wireless
manner for the communication service between the optical branching
divider and the optical network unit. When the optical fiber
communication system is working, the second detection module 31
detects the amplitude, power and/or energy of the signal
transmitting in the optical fiber communication system. When a
failure of being cut off happens in the optical fiber between the
optical branching divider 2 and the first optical network unit 3,
the second detection module 31 detects that the amplitude, power
and/or energy of the signal are lower than the preset threshold and
considers that the signal is lost. The communication service switch
device 8 switches the user terminal integration access device 4 to
the wireless user terminal device 7 to make the communication
service of the optical fiber communication system be switched to
the wireless communication system. Because the optical fiber
communication is better than the wireless communication system in
the aspect of transmitting rate and stability and so on, it is
considered that the failure of being cut in the optical fiber is
eliminated when the second detection module 31 detects that the
amplitude, power and/or energy of the signal from branching divider
2 are higher than the preset threshold. The communication service
switch device 8 switches the user terminal integration access
device 4 to the first optical network unit 3 make the communication
service be switched back to the optical fiber communication
system.
The present invention adopts the 1+1 protection manner to protect
the optical fiber line between the optical line terminal and the
optical branching divider in the optical fiber access network, and
adopts the wireless communication system to protect the optical
fiber line between the optical branching divider and the optical
network unit in the star structure optical fiber access network at
the same time, which not only meets the need of user to the
unusable time of the network so as to ensure the fluency of the
communication service of the user in the stat structure optical
network and especially the group users, but also breaks through the
restriction of the resource of the pipe and optical cable and
reduces the cost of investment, operation and maintenance. It can
also be used to quickly cover the communication area where there is
no optical cable in wireless way. After the optical cable is paved,
the wireless communication system can be used as the protection
system of the optical fiber communication system so as to
facilitate the implementation step by step and the utilization of
the device. In addition, the present invention sets the wireless
base station near the optical branching divider so as to reduce the
requirement for the coverage scope of the wireless base station. At
the same time, the problem of stadia transmission in a project can
be easily solved. The present invention adopts the wireless
communication system which can dynamically allocate the bandwidth
to protect the fiber access network. After the failure of being cut
off in the access optical fiber happens, the bandwidth of the
wireless communication system can be concentrated to the optical
network unit influenced to protect the bandwidth need of the user.
When there isn't any failure, it can provide the wireless access
service for many users so as to increase the utilization rate of
the bandwidth in the communication system and enrich the service
provided.
The present invention will be described in more detail with
reference too the following figures and embodiments.
A more detailed description of the invention is provided in the
following description and appended claims taken in conjunction with
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the system structure view of the optical fiber access
network in accordance with the present invention;
FIG. 2 shows the processing flow chart for switching the
communication service from the optical fiber communication system
to the wireless communication system;
FIG. 3 shows the processing flow chart for switching the
communication service from the wireless communication system back
to the optical fiber communication system.
DETAILED DESCRIPTION OF THE INVENTION
The following is a detailed description and explanation of the
preferred embodiments and best modes contemplated by the inventors
of carrying the invention along with some examples thereof.
The main idea of the present invention is to bring in the wireless
communication system to protect the optical fiber line between the
optical branching divider 2 and the first optical network unit 3 in
the star structure optical fiber access network. The optical fiber
access network with protection comprises the optical fiber
communication system, the wireless communication system, the second
optical network unit 6, and the communication service switch device
8. The communication service switch device 8 switches the
communication service from the optical fiber communication system
to the wireless communication system when there is failure of being
cut off in the optical fiber between the optical branching divider
2 and the first optical network unit 3 in the optical fiber
communication system. Because the optical fiber communication is
better than the wireless communication system at the aspect of
transmitting rate and stability, etc, the communication service
switch device 8 switches the communication service from the
wireless communication system back to the optical fiber
communication system after the failure of being cut off in the
optical fiber is cleared.
FIG. 1 is the system structure view of the optical fiber access
network in accordance with the present invention. In the optical
fiber access network, the optical fiber communication system at
least comprises an optical line terminal 1, an optical branching
divider 2, the first optical network unit 3 and an integration
access device of user terminal 4. Wherein, the optical line
terminal 1 has an interface to the switching equipment, router and
the optical branching divider 2 to communicate with the optical
branching divider through the work fiber 91 and the protection
optical fiber 92 which protects the line of the work fiber 91, and
provide necessary means to transmit various communication services.
A first detection module 11 for detecting the signal in the work
fiber 91 and protection optical fiber 92 and a network managing
system 12 for managing integrated services of the optical line
terminal 1 are set in the optical line terminal 1. The first
detection module 11 is connected with the network managing system
12. The optical branching divider 2 provides the physical
connection taking optical fiber as the transmission medium for the
first optical network unit 3 and optical line terminal 1, makes the
signal transmitted in optical fiber conduct power reallocation
after being coupled in the coupling area. The first optical network
unit 3 is connected with the communication service switch device 8
for switching the communication line by optical fibers. The first
optical network unit 3 at least comprises a second detection module
31 for detecting signals, an alarm module 33 for producing an alarm
message of signal loss when the second detection module 31 detects
no signal, a control module 32 for sending a switch control signal
to the communication service switch device 8, a service interface
function module 34 for sending and receiving the message of the
wireless user terminal device 7 and a power supply and maintenance
management function module 35 for supplying power and managing
integrated services to the first optical network unit 3. Wherein,
the second detection module 31 is connected with the alarm module
and the power supply and maintenance management function module,
and can also be connected with the control module 32. Specifically,
amplitude, power and/or energy detection devices and so on can be
adopted. The alarm module 33 is connected with the service
interface function module 34 and can be integrated with the
detection module 31. The service interface function module 34 is
also connected with the power supply and maintenance management
function module 35 and the communication service switch device 8,
and is connected with the optical branching divider 2 and the
wireless user terminal device 7. The control module 32 is
communicated with the service interface function module 34 and the
power supply and maintenance management function module 35.
The wireless communication system comprises a wireless base station
5 and the wireless user terminal device 7, wherein the wireless
base station 5 is set near the optical branching divider 2,
communicates with the optical branching divider 2 through the
second optical network unit 6, and wirelessly communicates with the
wireless user terminal device 7 so as to accomplishing the wireless
sending and receiving and the management of the wireless resource
etc, which can be a point to point system or one point to several
points system, for example, a WiMax system. The wireless user
terminal device 7 is provided with a first optical network unit 3
and the interface of the user terminal integration access device 4.
The wireless user terminal device 7 is connected with the
communication service switch device 8 for switching the
communication line, and is connected with said first optical
network unit 3 for receiving the alarm message coming from the
first optical network unit 3 and the communication service switched
so as to realize the message transmission between the wireless base
station 5 and the user terminal integration access device 4.
Communication service switch device 8 is used to switch the
communication line, wherein the wireless user terminal device 7 and
the first optical network unit 3 are connected with the
communication service switch device 8 respectively. The
communication service switch device 8 is connected with the user
terminal integration access device 4. The switch of the
communication service switch device 8 is controlled by the control
module 32 in the first optical network unit 3, which can be set
independent to the first optical network unit 3 or in the first
optical network unit 3, i.e. integrated with the communication
service switch device 8. Specifically, an electric switch, an
optical switch, a photoelectric switch, a micro-mechanical switch
or an optical waveguide switch and so on can be adopted.
When the optical fiber communication system is working, the second
detection module 31 detects the signal transmitted in the work
line. When there is failure of being cut off in the optical fiber
between the optical wiring network 2 and the first optical network
unit 3, the communication service switch device 8 switches the
communication service transmitted between the optical wiring
network 2 and the first optical network unit 3 to the wireless
communication system, i.e. switches the communication service from
the optical fiber communication system to the wireless
communication system. As shown in FIG. 2, it is the specific
processing flow of switching the communication service from the
optical fiber communication system to the wireless communication
system, and following steps are executed:
201. when the second power meter 31 detects that the signal power
is less than the preset threshold power, it is considered that the
downlink signal is lost;
202. the second power meter 31 sends the message of signal loss to
the alarm module 33;
203. the alarm module 33 transmits the alarm message of signal loss
to the wireless user terminal device 7;
204. the wireless user terminal device 7 sends the message for
requiring bandwidth allocation to the wireless base station 5;
205. the wireless base station 5 allocates the corresponding
bandwidth to the wireless user terminal device 7, and sends the
confirmation message that the bandwidth has been allocated;
206. the wireless user terminal device 7 sends the request message
for switching the communication service to the wireless
communication system to the control module 32;
207. the control module 32 sends a switching control signal to the
switch;
208. the switch switches the communication line connected with the
first optical network unit 3 to the wireless user terminal device 7
in accordance with the switching control signal so as to make the
uplink signal of the communication service be switched to the
wireless user terminal device 7;
209. the wireless user terminal device 7 transmits the uplink
signal to the wireless base station 5;
210. the wireless base station 5 transmits the uplink signal to the
optical line terminal 1;
211. the optical line terminal 1 sends the downlink signal to the
wireless base station 5 through the optical network unit 6;
212. the wireless base station 5 sends the downlink signal to the
corresponding wireless user terminal device 7 so as to complete the
switching of the communication service line.
Wherein, the message of signal loss can also be directly sent to
the control module 32 after the second power meter 31 detects that
the downlink signal power is less than the preset threshold power.
The control module 32 controls the switch to switch the
communication service to the wireless communication system, i.e.
the steps 202.about.206 can be omitted.
Because it is a broadcast mode at the downlink direction, the
second power meter 31 in the first optical network unit 3 can
detect the signal coming from the optical line terminal 1 after the
failure of being cut off in the optical fiber between the optical
wiring network 2 and the first optical network unit 3 is repaired.
The communication service switch device 8 switches the
communication service transmitted by the wireless communication
system back to the optical fiber communication system, i.e. it
switches the communication service from the wireless communication
system back to the optical fiber communication system. As shown in
FIG. 3, it is the specific processing flow of switching the
communication service from the wireless communication system back
to the optical fiber communication system, and the following steps
are executed:
301. when the second power meter 31 detects that the signal power
is larger than the preset threshold power, the downlink signal is
considered to be received;
302. the second power meter 31 sends message that the signal is
received to the alarm module 33;
303. the alarm module 33 sends a message that the alarm of signal
loss is relieved to the wireless user terminal device 7;
304. the wireless user terminal device 7 sends a request message
for bandwidth release to the wireless base station 5;
305. the wireless base station 5 releases the corresponding
bandwidth, and sends the confirmation message for bandwidth release
to the wireless user terminal device 7;
306. the wireless user terminal device 7 sends a request message
for switching the communication service to the optical fiber
communication system to the control module 32;
307. the control module 32 sends a switching control signal to the
switch;
308. the switch switches the communication line connected with the
wireless user terminal device 7 to the first optical network unit 3
in accordance with the switching control signal so as to make the
uplink signal of the communication service be switched to the first
optical network unit 3;
309. the first optical network unit 3 transmits the uplink signal
of the communication service to the optical line terminal so as to
accomplish the switching of the communication service line.
In the same way, the message that the signal is received can be
directly sent to the control module 32 after the second power
rating meter 31 detects that the signal power is larger than the
preset threshold power. The control module 32 controls the switch
to switch the communication service to the optical fiber
communication system, i.e. the steps 302.about.306 can be
omitted.
It should be understood that the above embodiments are only used to
explain, but not to limit the technical solution of the present
invention. In addition to the detailed description of the present
invention referring to above preferred embodiments, it should be
understood that various modifications, changes or equivalent
replacements can be made by those skilled in the art without
departing from the spirit and scope of the present invention and
covered in the claims of the present invention.
Furthermore, although embodiments and examples of the invention
have been shown and described, it is to be understood that various
modifications, substitutions, and rearrangements of components,
parts, structural features, and method steps, as well as other uses
of the invention, and other processes, can be made by those skilled
in the art without departing from the novel spirit and scope of the
invention.
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